Crane stress testing device based on wireless transmission

Abstract

The utility model discloses a crane stress testing device based on wireless transmission. The crane stress testing device comprises a stress testing module, a simulation conditioning module, an AD conversion module, a main control module, a wireless communication module and a power supply module. The stress testing module comprises a strain gauge and a measuring circuit; the input end of the simulation conditioning module is electrically connected with the stress test module; the input end of the AD conversion module is electrically connected with the output end of the analog conditioning module; the input end of the main control module is electrically connected with the output end of the AD conversion module; the wireless communication module is electrically connected with the main control module; the power supply module is electrically connected with a module needing power supply; the crane stress testing device is low in cost, small in size, convenient to install and use, long in wireless transmission distance, strong in anti-interference capability, high in sensitivity and low in power consumption, and the wiring problem in the crane stress testing process is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to the stress strain measurement technical field of crane, concretely is a kind of crane stress testing device based on wireless transmission. BACKGROUND

[0002] With the rapid development of our country, crane is widely applied in port transportation, railway traffic, mining metallurgy and other fields.Crane has large working load, once crane appears damage, will cause major safety accident.So as to ensure that crane runs safely, the stress strain of its work needs to be measured.Considering the large structure of large crane, measurement point is widely distributed on crane, and the conventional wired stress strain data acquisition equipment has the problems of complex wiring, inaccurate measurement caused by cable resistance, and limited distance between different measurement points.There is certain risk in the working process of crane, and data measurement personnel close to crane will have certain safety risk.Therefore, a kind of high-efficiency and reliable device for wireless measurement of crane stress strain is needed. SUMMARY

[0003] The utility model aims at overcoming the shortcomings of above-mentioned background art, provide a kind of based on wireless transmission's crane stress testing device of convenient installation, low in cost, long distance of wireless transmission.

[0004] The technical scheme of the utility model is: a kind of crane stress testing device based on wireless transmission, including device shell, stress testing module, analog conditioning module, AD conversion module, main control module, wireless communication module, characterized by: the circuit board is equipped in the device shell, the circuit board is connected stress testing module input end, the stress testing module, output end is connected with analog conditioning module input end by circuit board, realizes to the analog quantity that stress testing module transmission comes first amplification after filtering;The output end of analog conditioning module is connected with the input end of AD conversion module, realizes analog quantity conversion into digital quantity;The output end of AD conversion module is connected with the main control module for controlling the whole device, the main control module is connected with the wireless communication module for communicating with host computer, the wireless communication module includes antenna, and is set on device shell;The power module is connected with circuit board, provides 5V voltage for each module.

[0005] The stress testing module includes measurement strain gauge and temperature compensation strain gauge, measurement strain gauge is directly pasted on crane measurement point, temperature compensation strain gauge is placed around, so that they are in the same temperature environment, and half-bridge connection form is adopted.

[0006] The analog conditioning module comprises an integrated single power instrument amplifier AD623, a four-way operational amplifier IC chip LM2902 and external circuits, and is used for amplifying and filtering the analog signal

[0007] The AD conversion module comprises an HX711 chip and external circuits, and is used for converting the analog quantity into a digital quantity for subsequent processing.

[0008] The main control module comprises an STC89C52 chip and peripheral circuits, and is used for controlling the whole device.

[0009] The wireless communication module comprises a LoRa communication module and peripheral circuits, and is used for wireless communication with the upper computer.

[0010] The power module comprises a lithium battery and peripheral circuits, and is used for providing a power supply with a voltage of 5V.

[0011] Compared with the prior art, the utility model discloses low manufacturing cost, and installation is simple and convenient, avoids complex wiring, adopts LoRa module communication, and the transmission distance is far, signal penetration is strong, transmission is stable, and power is low, avoids the measurement personnel constantly debugging, and simultaneously, the device is multichannel, can realize the measurement to multiple measuring points simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structure diagram of the utility model;

[0013] Figure 2 It is the structure diagram of the utility model;

[0014] Figure 3 It is the sectional view of the utility model;

[0015] Figure 4 It is the distributed measurement schematic diagram of the utility model;

[0016] Figure 5 It is the communication module communication mode diagram of the utility model;

[0017] 1, device shell, 2, stress test module, 3, analog conditioning module, 4, AD conversion module, 5, main control module, 6, wireless communication module, 7, power module, 8, the measuring point of crane, 9, crane, 10, LoRa wireless communication module, 11, LoRa gateway. DETAILED DESCRIPTION

[0018] The embodiment is a crane stress test device based on wireless transmission, as shown in Figure 1, Figure 2 , Figure 3 As shown, it includes a device housing (1), a stress testing module (2), an analog conditioning module (3), an AD conversion module (4), a main control module (5), a wireless communication module (6), and a power supply module (7);

[0019] like Figure 4 As shown, the strain gauges in the stress testing module are directly attached to the measurement points (8) of the crane (9); the input end of the analog conditioning module (3) is electrically connected to the output end (2) of the stress testing module via a circuit board, and amplifies and filters the analog quantity transmitted from the stress testing module; the input end of the AD conversion module (4) is electrically connected to the output end of the analog conditioning module (3) via a circuit board, and converts the analog quantity into a digital quantity; the main control module (5) is electrically connected to the output end of the AD conversion module (4) via a circuit board, and controls the entire testing device; the wireless communication module (6) is electrically connected to the main control module (5) via a circuit board, and is used to communicate with the host computer; the power supply module (7) provides 5V voltage to other modules via a circuit board.

[0020] Among them, the stress test module (2) measurement circuit adopts a half-bridge connection form.

[0021] The strain gauge is a foil strain gauge with a resistance of 350 ohms. It also uses bridge temperature compensation. During operation, the measuring strain gauge is attached to the measuring point, and another compensating strain gauge is placed around it to keep them in the same temperature environment.

[0022] The analog conditioning module (3) includes an amplifier circuit and a filter circuit, which consists of an integrated single-supply instrumentation amplifier AD623, a four-channel operational amplifier IC chip LM2902, and external circuits to amplify and filter the analog signal.

[0023] The AD conversion module (4) includes an HX711 chip and external circuitry, and is capable of analog-to-digital conversion.

[0024] Among them, the main control module (5) includes peripheral circuits and the main control chip STC89C52, which is inexpensive and has low cost.

[0025] Among them, the wireless communication module (6) is a LoRa wireless communication module (10), specifically model DX-LR01, which has a long transmission distance, strong signal penetration, stable transmission and low power consumption.

[0026] The power module (7) includes a lithium battery and peripheral circuitry, and is capable of providing a 5V voltage.

[0027] The specific implementation process of the embodiment: according to the measurement requirements, a plurality of the utility model are selected to measure the distributed stress and strain of the crane. The strain gauge is pasted on the measurement point of the crane, and the compensation strain gauge is placed in the same ambient temperature. A 5V voltage is provided through the power module (7), when the stress at the measurement point changes, the stress test module (2) measures an analog quantity, which is amplified and filtered through the analog conditioning module (3), and then converted into a digital quantity through the AD conversion module (4), transmitted to the main control module (5) for processing, and finally, as shown in Figure 5 The LoRa wireless communication module (10) transmits the measurement data to the host computer through the LoRa gateway (11).

Claims

1. A wireless transmission-based crane stress testing device, comprising a device shell, a stress testing module, an analog conditioning module, an AD conversion module, a master control module, and a wireless communication module, characterized in that: The device shell is internally provided with a circuit board, the stress test module input end is connected with the circuit board, the stress test module output end is connected with the analog conditioning module input end through the circuit board, the analog conditioning module output end is connected with the AD conversion module input end, the AD conversion module output end is connected with the master control module for controlling the whole device, the master control module is connected with the wireless communication module for communicating with the upper computer, the wireless communication module contains an antenna and is arranged on the device shell, and the power module is connected with the circuit board and provides 5V voltage for each module.

2. A wireless transmission based crane stress testing device according to claim 1, characterized in that: The stress test module contains a measurement strain gauge and a temperature compensation strain gauge, the measurement strain gauge is directly pasted on a crane measurement point, and the temperature compensation strain gauge is placed around the measurement point in a half-bridge connection form.

3. The wireless transmission based crane stress testing device of claim 1, wherein: The analog conditioning module contains an integrated single power instrument amplifier AD623, a four-way operational amplifier IC chip LM2902 and an external circuit, and analog signals are amplified and then filtered.

4. The wireless transmission based crane stress testing device of claim 1, wherein: The AD conversion module contains an HX711 chip and an external circuit, and is used for converting analog quantity into digital quantity for subsequent processing.

5. The wireless transmission based crane stress testing device of claim 1, wherein: The master control module contains an STC89C52 chip and a peripheral circuit, and is used for controlling the whole device.

6. The wireless transmission based crane stress testing device of claim 1, wherein: The wireless communication module contains a LoRa communication module and a peripheral circuit, and is used for wireless communication with the upper computer.

7. The wireless transmission based crane stress testing device of claim 1, wherein: The power module contains a lithium battery and a peripheral circuit, and is used for providing a power supply with a voltage of 5V.

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